【判断题】An ex-Facebook boss said social media is damaging society
【单选题】为了保证柴油机的使用寿命及工作可靠性,非增压高速柴油机标定功率确定受( )限制。
【简答题】为了保证柴油机的使用寿命及工作可靠性,非增压高速柴油机标定功率确定受( B )限制。 [1分]
【判断题】展弦比是指机翼翼展与机翼弦长的比值。 ()
【判断题】在一定气流速度条件下,管道的直径越小,其摩擦阻力就越小。()
【单选题】Read the paragraph from the introduction [paragraphs 1-3]. Carter is the first ex-president to turn 95 years old. His one-term presidency ended in 1981. He has been an ex-president for almost 39 years...
A.
How is Jimmy Carter different from other ex-presidents?
B.
When did Jimmy Carter celebrate his 95th birthday?
C.
What did Jimmy Carter do while he was the president?
D.
Why did Jimmy Carter's presidency end in 1981?
【单选题】为了保证柴油机的使用寿命及工作可靠性,非增压高速柴油机标定功率确定受 ( )限制。
【判断题】机翼的展弦比是指翼展长度与平均几何翼弦长度之比。